The free version of Hyper-V has been updated to 2012 R2 and released and available to download … for free. This is the same Hyper-V as you get in the Standard and Datacenter editions minus the GUI and Automatic Virtual Machine Activation (AVMA – Datacenter only).
You can learn more about Hyper-V Server 2012 R2 here. Did I mention that it’s free? And full scalable? And includes HA, and … and … ?